Albert Hofmann accidentally discovers the hallucinogenic effects of the research drug LSD.

McDonald’s restaurant dates its founding to the opening of a franchised restaurant by Ray Kroc, in Des Plaines, Illinois.

A massacre is organized by the Ottoman Empire against the Armenian population of Cilicia.

Henry V is crowned Holy Roman Emperor.

United Kingdom agrees to Singaporean self-rule.

The Great Gatsby by F. Scott Fitzgerald is first published in New York City, by Charles Scribner’s Sons.

A student stabs 20 people at Franklin Regional High School in Murrysville, Pennsylvania.

Dutch physicist Heike Kamerlingh Onnes discovers superconductivity.

Soviet Defense Minister Dmitry Yazov orders the Soviet withdrawal from Afghanistan.